Facebook, Instant, Death, Syndrome. When you attempt to log into your facebook account to find the powers that be at facebook deem the actions you have partaken in too raw. Resulting in them killing your profile off. Common causes - Telling an old Ukranian man that a photo of his 90 year old mother is giving you a fat. Or that his German Shepperd has its lipstick out.

Sailors use this term in a derogatory sense with reference to others who are extremely useless. The fid is a device used by sailors to untie stubborn knots. This is the only application for this equipment, hence the derogatory connotation.

Ace: Wow champ really blew the big game last night, he ran the wrong way with 20 seconds left.
Gary: Yeah, that champ is a real fid.

FID is the acronym for "fatty in disguise". A fatty in disguise is usually a woman who uses deceptive tactics to conceal her large body mass. She will often wear black to slim her figure or wear large multicolored garments as a distraction to her prey. When online, the FID will often take pictures at awkward angles and these photos will usually only be head shots.

With practice and experience, a man can quickly spot a FID and avoid wasting his time and energy.

"Mary's online dating profile looked really good, and she had a lot of nice headshots. I enjoyed talking to her on AIM and the phone. But after doing some stalking on google, I found out that she's really a FID, a fat, wretched, beast of a woman."

"That girl has big tits but its just all fat, take a closer look past that floral pattern on her dress, she's a FID man! Don't do it! "